282 lines
7.0 KiB
Python
282 lines
7.0 KiB
Python
"""
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Celery tasks for djeuscan
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"""
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from itertools import islice
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from celery.task import task
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from celery.task.sets import TaskSet
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from django.conf import settings
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from djeuscan.models import Package, RefreshPackageQuery
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from djeuscan.processing.misc import regen_rrds, update_counters, \
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update_portage_trees
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from djeuscan.processing.scan import scan_metadata, scan_portage, scan_upstream
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class TaskFailedException(Exception):
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"""
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Exception for failed tasks
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"""
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pass
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def _chunks(it, n):
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"""
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Chunk generator, takes an iterator and the desired size of the chunk
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"""
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for first in it:
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yield [first] + list(islice(it, n - 1))
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def _run_in_chunks(task, packages, kwargs=None,
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concurrently=settings.TASKS_CONCURRENTLY,
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n=settings.TASKS_SUBTASK_PACKAGES):
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"""
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Launches a TaskSet at a time with <concurrently> subtasks.
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Each subtask has <n> packages to handle
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"""
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output = []
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chunk_generator = _chunks(iter(packages), n)
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done = False
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while not done:
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tasks = []
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for _ in range(concurrently):
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try:
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chunk = chunk_generator.next()
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except StopIteration:
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done = True
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else:
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tasks.append(task.subtask((chunk, ), kwargs))
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job = TaskSet(tasks=tasks)
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result = job.apply_async()
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# TODO: understand why this causes timeout
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output.extend(list(result.join()))
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return output
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@task
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def regen_rrds_task():
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"""
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Regenerate RRDs
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"""
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return regen_rrds()
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@task
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def update_counters_task(fast=True):
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"""
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Updates counters
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"""
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return update_counters(fast=fast)
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@task
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def _scan_metadata_task(packages):
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"""
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Scans metadata for the given set of packages
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"""
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logger = _scan_metadata_task.get_logger()
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logger.info("Starting metadata scanning subtask for %d packages...",
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len(packages))
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scan_metadata(
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packages=packages,
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logger=logger,
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)
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@task
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def scan_metadata_list_task(query):
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"""
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Runs a parallel metadata scan for packages in the query list (space
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separated string). Task used only from the web interface.
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"""
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return _run_in_chunks(_scan_metadata_task, [p for p in query.split()])
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@task
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def scan_metadata_all_task():
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"""
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Runs a parallel metadata scan for all packages
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"""
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return _run_in_chunks(_scan_metadata_task, Package.objects.all())
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@task
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def _scan_portage_task(packages, no_log=False, purge_packages=False,
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purge_versions=False, prefetch=False):
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"""
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Scans portage for the given set of packages
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"""
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logger = _scan_portage_task.get_logger()
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if packages:
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logger.info("Starting portage scanning subtask for %d packages...",
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len(packages))
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else:
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logger.info("Starting portage scanning for all packages...")
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scan_portage(
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packages=packages,
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no_log=no_log,
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purge_packages=purge_packages,
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purge_versions=purge_versions,
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prefetch=prefetch,
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logger=logger,
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)
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@task
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def scan_portage_list_task(query, no_log=False, purge_packages=False,
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purge_versions=False, prefetch=False):
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"""
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Runs a parallel portage scan for packages in the query list (space
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separated string). Task used only from the web interface.
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"""
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kwargs = {"no_log": no_log, "purge_packages": purge_packages,
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"purge_versions": purge_versions, "prefetch": prefetch}
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return _run_in_chunks(_scan_portage_task, [p for p in query.split()],
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kwargs)
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@task
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def scan_portage_all_task(no_log=False, purge_packages=False,
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purge_versions=False, prefetch=False):
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"""
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Runs a syncronous portage scan for all packages
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"""
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return _scan_portage_task(
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packages=None,
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no_log=no_log,
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purge_packages=purge_packages,
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purge_versions=purge_versions,
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prefetch=prefetch,
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)
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@task
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def _scan_upstream_task(packages, purge_versions=False):
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"""
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Scans upstream for the given set of packages
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"""
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logger = _scan_upstream_task.get_logger()
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logger.info("Starting upstream scanning subtask for %d packages...",
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len(packages))
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result = scan_upstream(
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packages=packages,
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purge_versions=purge_versions,
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logger=logger,
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)
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# TODO: implement some kind of error raising in case of failure
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#if not result:
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# raise TaskFailedException
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return result
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@task
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def scan_upstream_list_task(query, purge_versions=False):
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"""
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Runs a parallel upstream scan for packages in the query list (space
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separated string). Task used only from the web interface.
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"""
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kwargs = {"purge_versions": purge_versions}
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return _run_in_chunks(_scan_upstream_task, [p for p in query.split()],
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kwargs)
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@task
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def scan_upstream_all_task(purge_versions=False):
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"""
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Runs a parallel portage scan for all packages
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"""
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kwargs = {"purge_versions": purge_versions}
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return _run_in_chunks(
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_scan_upstream_task,
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Package.objects.all().order_by('?'),
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kwargs
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)
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@task
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def update_portage_trees_task():
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"""
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Update portage tree
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"""
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logger = update_portage_trees_task.get_logger()
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update_portage_trees(logger=logger)
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@task
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def update_task(update_portage_trees=True, scan_portage=True,
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scan_metadata=True, scan_upstream=True, update_counter=True):
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"""
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Update the whole euscan system
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"""
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if update_portage_trees:
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update_portage_trees_task()
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if scan_portage:
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scan_portage_all_task(prefetch=True, purge_packages=True,
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purge_versions=True)
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# metadata and upstream scan can run concurrently, launch them
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# asynchronously and wait for them to finish
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metadata_job = None
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if scan_metadata:
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metadata_job = scan_metadata_all_task().delay()
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upstream_job = None
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if scan_upstream:
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upstream_job = scan_upstream_all_task().delay()
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if metadata_job:
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metadata_job.wait()
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if upstream_job:
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upstream_job.wait()
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update_counters(fast=False)
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@task
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def scan_package_task(package):
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_scan_portage_task([package], purge_packages=True, purge_versions=True)
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_scan_metadata_task([package])
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_scan_upstream_task([package])
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# Periodic tasks
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@task
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def consume_refresh_package_request():
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"""
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Satisfies user requests for package refreshing, runs every minute
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"""
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try:
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obj = RefreshPackageQuery.objects.all().order_by('-priority')[0]
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except IndexError:
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return {}
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else:
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result = scan_package_task(obj.package)
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obj.delete()
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return result
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admin_tasks = [
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regen_rrds_task,
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update_counters_task,
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scan_metadata_list_task,
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scan_metadata_all_task,
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scan_portage_all_task,
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scan_portage_list_task,
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scan_upstream_all_task,
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scan_upstream_list_task,
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update_portage_trees_task,
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update_task,
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scan_package_task,
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]
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